Fix for identity rates

Fixes #26

Author: sposs

forex_python/converter.py

@@ -56,6 +56,8 @@ def get_rates(self, base_cur, date_obj=None):
         raise RatesNotAvailableError("Currency Rates Source Not Ready")
 
     def get_rate(self, base_cur, dest_cur, date_obj=None):
+        if base_cur == dest_cur:
+            return 1.
         date_str = self._get_date_string(date_obj)
         payload = {'base': base_cur, 'symbols': dest_cur}
         source_url = self._source_url() + date_str